Fix #2626: Duplicate scheduled year for single day events

- Removes redundant rendering of next_time.dt_start year block inside time_tag.html for single_day events
- Adds unit tests to ensure the DOM output for single day events generates the year precisely once.

Author: iampujan

apps/events/templates/events/includes/time_tag.html

@@ -4,10 +4,6 @@
             {{ next_time.dt_start|date:"Y" }}
         </span>
 
-        <span id="start-{{ object.id }}"{% if scheduled_end_this_year %} class="say-no-more"{% endif %}>
-            {{ next_time.dt_start|date:"Y" }}
-        </span>
-
         {% if not next_time.all_day %}
             {{ next_time.dt_start|date:"fA"|lower }} {{ next_time.dt_start|date:"e" }}
                 {% if next_time.valid_dt_end %} – {{ next_time.dt_end|date:"fA"|lower }}

apps/events/tests/test_templates.py

@@ -0,0 +1,52 @@
+import datetime
+
+from django.template.loader import render_to_string
+from django.test import TestCase
+
+from ..models import Event, EventLocation, Calendar
+
+
+class TimeTagTemplateTests(TestCase):
+    def test_single_day_event_year_rendering(self):
+        """
+        Verify that a single-day event does not render the year twice (Issue #2626).
+        """
+        # Create a single day event in the future to trigger the year rendering condition
+        future_year = datetime.date.today().year + 1
+        
+        calendar = Calendar.objects.create(name="Test Calendar")
+        
+        event = Event.objects.create(
+            title="Single Day Future Event",
+            description="Test event",
+            calendar=calendar,
+        )
+        
+        # Manually create the next_time context object
+        class MockTime:
+            def __init__(self):
+                self.dt_start = datetime.datetime(future_year, 5, 25, 12, 0)
+                self.dt_end = datetime.datetime(future_year, 5, 25, 14, 0)
+                self.single_day = True
+                self.all_day = False
+                self.valid_dt_end = True
+
+        context = {
+            "next_time": MockTime(),
+            "scheduled_start_this_year": False,  # Event is in the future year
+            "scheduled_end_this_year": False,
+            "object": event,
+        }
+
+        rendered = render_to_string("events/includes/time_tag.html", context)
+        
+        # The year should only appear visibly once in the output (not counting the datetime ISO tag).
+        year_str = str(future_year)
+        # Using string splitting to exclude the `datetime="2027...` occurrence by checking how many times
+        # it appears wrapped with whitespace or inside a span.
+        visible_occurrences = rendered.split(">\n            " + year_str + "\n        </span>")
+        self.assertEqual(
+            len(visible_occurrences) - 1,
+            1,
+            f"Expected the visible span containing {year_str} to appear exactly once, but it was duplicated: {rendered}"
+        )